Method for processing sensor signals

Abstract

A method for processing sensor signals in a control unit of a motor vehicle and a control unit for carrying out the method. The control unit is provided for the open-loop and/or closed-loop control of a system and acquires signals from this system. The system is modeled with the aid of a model, at least one value being ascertained for a slow signal based on the model.

What is claimed is: 
     
         1 . A method for processing sensor signals in a control unit of a motor vehicle, the control unit being provided for open-loop and/or closed-loop control of a system, the method comprising:
 acquiring signals from the system, of which at least one signal is classified as slow signal and at least one signal is classified as fast signal;   ascertaining at least one value for the at least one slow signal based on a model of the system.   
     
     
         2 . The method as recited in  claim 1 , wherein a time characteristic of the at least one slow signal is ascertained. 
     
     
         3 . The method as recited in  claim 1 , wherein the system is modeled with a system model. 
     
     
         4 . The method as recited in  claim 1 , wherein the system is modeled dynamically with at least one of the at least one fast signals and at least one input quantity into the system. 
     
     
         5 . The method as recited in  claim 1 , further comprising:
 adapting the model based on measured values in order to correct an observational error.   
     
     
         6 . The method as recited in  claim 1 , further comprising:
 at least one of controlling and regulating an exhaust gas recirculation in a combustion engine using the method.   
     
     
         7 . The method as recited in  claim 6 , wherein the method is used in conjunction with a cylinder-charge control. 
     
     
         8 . The method as recited in  claim 1 , wherein a controller signal is utilized as the fast signal. 
     
     
         9 . The method as recited in  claim 8 , wherein a signal relating to at least one of a pressure-sensor value and a mass-flow value, is utilized as the slow signal. 
     
     
         10 . A control unit for the open-loop and/or closed-loop control of a system, the control unit configured to acquire signals from the system, of which at least one signal is classified as slow signal and at least one signal is classified as fast signal, wherein the control unit is equipped to carry out a function in which the system is modeled with the aid of a model and at least one value is ascertained for the at least one slow signal based on the model. 
     
     
         11 . The control unit as recited in  claim 10 , wherein the control unit is an engine control unit. 
     
     
         12 . The control unit as recited in  claim 10 , wherein the function is implemented in a computer program that is stored in the control unit.